What does one turtle in Cantonese mean?

Turtles cost one yuan each. Actually, it doesn't mean anything. It's a sentence in Cantonese tongue twister.

One version is like this.

"A mosquito and a turtle.

A mosquito and a chicken.

Go to the street to buy gold turtles.

Go to the end of the street to buy golden roosters

Your words are very expensive. "